Open AccessSwm1p, a subunit of the APC/cyclosome, is required to maintain cell wall integrity during growth at high temperature in Saccharomyces cerevisiae
Author(s) -
Ufano Sandra,
Rey Francisco,
Vázquez de Aldana Carlos R.
Publication year - 2004
Publication title -
fems microbiology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 151
eISSN - 1574-6968
pISSN - 0378-1097
DOI - 10.1111/j.1574-6968.2004.tb09556.x
Subject(s) - chitin synthase , cell wall , chitin , saccharomyces cerevisiae , mutant , protein subunit , biology , biochemistry , lysis , microbiology and biotechnology , cell growth , atp synthase , yeast , enzyme , chitosan , gene
Swm1p, a subunit of the APC cyclosome, was originally identified for its role in the later stages of the sporulation process and is required for spore wall assembly. In addition, this protein is required to maintain cell wall integrity in vegetative cells during growth at high temperature. Electron microscopy analyses of mutant cells grown at the restrictive temperature in the absence of osmotic support show that the cell wall is clearly abnormal, with large number of discontinuities that may be responsible for the observed lysis. The mutant cells show a 7‐fold reduction in glucan synthase activity during growth at 38 °C and a 3.5‐fold increase in the chitin content of the cell wall. The chitin is deposited in a delocalized manner all over the cell wall, where it accumulates in patches in abnormal regions. The excess chitin is mainly synthesized by the action of chitin synthase III (Chs3p), since it disappears in the swm1 chs3 double‐mutant.